variance - nodef/extra-number GitHub Wiki
Find the mean of squared deviation of numbers from its mean.
function variance(...xs)
// xs: a list of numbers
const xnumber = require('extra-number');
xnumber.variance(1, 2);
// → 0.25
xnumber.variance(1, 2, 3);
// → 0.6666666666666666
xnumber.variance(1, 2, 3, 4);
// → 1.25